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Coffee grounds keep aphids away: True
Laurent Bourgeois, nurseryman, testifies: “We use it primarily on open ground aromatics that attract these critters a lot, such as absinthe and mugwort, in particular the lemon-scented aurone or harquebus (Artemisia abrotanum).
We sprinkle it on the surface at the foot of the plant, at least 20 to 25 cm wide (the diameter of a plate) and 5 mm thick, in order to create a repellent mulch. It lasts for several months. We then renew it.
Coffee grounds work on slugs: True
Because of the rough texture of its powder which makes it difficult for them to slide, just like wood ash. Think about it for your strawberry plants (another complementary solution:
pine needles!). The trick is not infallible, however. The grounds also have an impact on the trajectory of ants and attacks by carrot flies, mole crickets and wireworms.
Coffee grounds improve soil: True
It lightens earthy mixtures. By incorporating marc into the ready-to-use potting soil of your planters and pots, you will avoid the formation of a waterproof crust on the surface, compacted by successive waterings. Thanks to the marc, rainwater or watering water will penetrate deeper, right to the heart of the clods. Your plants will thus be better hydrated, more beautiful and more resistant to drought.
Plants in calcareous soil love grounds: False
Plants in calcareous soil love grounds. Its pH is around 6.2, “if you put too much, it acidifies the soil,” explains Christophe Savigny, artisan roaster.

Coffee grounds are good for compost: True
Putting the grounds on the pile is what Jean-Marc Parra, nurseryman at Ah! La Ferme des saveurs, does.
Purists will also place the ecological filters made of brown paper there.

Coffee grounds make hands softer: True
This natural exfoliant, thanks to its small grains, gently sands the skin to remove encrusted traces (earth, leaf green, etc.).
If you make your own soaps, remember to add several spoonfuls to the mixture of oils and soda.
Grounds prevent the earth from freezing: False
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